O-Ring Material Designation Question

[AirgunBill]

I have been going through the parts lists for the the FX Wildcat and Verminator rifles which I hope to be getting soon. I wanted to have on hand the necessary o-rings for maintenance. In going through the FX o-ring parts list I see the Buna-N 70 and 90 o-rings listed at The O-Ring Store. I do not see a designation of PUR 70 or 90. What is the PUR designation short for. Bill
Here is the O-Ring Store site listing their o-ring types
http://www.theoringstore.com/index.php?main_page=index&cPath=368 

 

[AirgunBill]

I was hoping with all the knowledgeable people here that someone could give me an answer to what seems a simple question. Anyone? Bill
Decided to link the Verminator Mk11 part list for you to see the PUR designation for some o-rings Part # B1 and F4
I have the Verminator in 5.5 or .22 cal on order
http://www.fxairguns.com/wp-content/uploads/2014/03/Verminator-MkII.pdf 

 

[Wizard]

Try this sight for your O-ring question.
https://www.physics.harvard.edu/uploads/files/machineshop/epm_oring_handbook.pdf

 

[Adamah]

Polyurethane

 

[AirgunBill]

Thanks Wizard for the information filled link to that site. And thank you Adamah to for that information too. Bill

 

[Wizard]

If you open the link I sent you will see on page 30 the two designators for Polyurethane. On page 44 you will see for air application of 200 degrees or less it is rated as poor.